Toyota 93 ecm- reverse engineering

[Cubah]

Hello,
Does anybody have experience with Such old cars ECm reverse enginering? I mean pcb to schematic convertion. I know that Toyota never published schematics, I am really interested to have. The first I would like to reverse Toyota Soarer 93 ECM.

Nice to hear your opinion or any help will be nice ...
Jake

[Rasz]

~$4K https://www.isensortech.com/
couple hundred if sourced directly from China, ~double that with middle men like https://www.chinapcbcopy.com/

but why would you want the diagram in the first place, its not like there is a vibrant market for factory ECU clones?

[Lindley]

More of a challenge would be to design and build your own ECM, building a simulated engine test bed with sensors to show how the ECM works.

[floobydust]

I would first ID the semiconductors to see if you can get datasheets on them. Unknown IC's can make it too difficult to figure out and reverse engineer, so a schematic is not much use then.
Nippon Denso liked to make custom ECU IC's, i.e. MAF sensor V/F, and use oddball Hitachi MCU.

[Circlotron]

Someone here might be able to point you in the right direction.
https://pcmhacking.net/forums/index.php